NameCensus.

UK boy's name

Rex

A masculine Latin name meaning "king" or "ruler".

For 2026, the newest official UK baby-name figures on this page are from 2024. That release is the current official benchmark rather than a forecast.

Rex is a boy's name in the UK records. People looking for Rex popularity in 2026 should use the latest official release, which is 2024 in this profile. In that release it ranked #216, with 228 babies registered with the name. Its strongest year in the published records was 2021, with 396 births.

This profile covers 4,025 England and Wales registrations across 29 recorded years from 1996 to 2024. The figures come from ONS England and Wales, NRS Scotland and NISRA Northern Ireland, so the page is a view of published baby-name registrations rather than a forecast or a live count of people using the name today.

The latest count is about 58% of the recorded peak, which gives a quick read on how the name has moved since its high point.

We estimate that about 4,161 living people in the UK are called Rex. This uses published birth registrations from England and Wales, Scotland and Northern Ireland, then applies ONS national life tables to estimate how many are likely still alive. It does not forecast extra births for 2025 or 2026.

Key insights

  • Rex ranked #216 for boys in England and Wales in 2024, with 228 registrations.
  • The name peaked in 2021, when 396 boys were registered as Rex.
  • Rex ranks best in Northern Ireland in the latest published regional snapshot for that area, where it placed #352 in 2022.
  • About 4,161 living people in the UK are estimated to have Rex as a first name, after adjusting past birth registrations with ONS life tables.

Latest rank (E&W)

#216

2024

Births in 2024

228

Latest year

Peak year

2021

396 births

Estimated living

4,161

2026

Meaning

What does Rex mean?

Rex is a masculine given name derived from the Latin word "rex", meaning "king". It originated in ancient Rome during the Roman Republic and Empire periods, and was used as a title for the ruler or sovereign of the Roman state.

The name Rex gained popularity during the Roman era, and was often associated with power, authority, and leadership. It was not uncommon for Roman rulers or members of the nobility to bear this name or use it as a cognomen (a personal surname or nickname).

One of the earliest and most notable historical references to the name Rex can be found in the writings of the Roman historian Livy, who mentioned a Roman general named Quintus Fabius Maximus Rullianus, also known as Rex, who lived in the 4th century BC. Rex was his cognomen, indicating his regal bearing or qualities.

In later centuries, the name Rex continued to be used, albeit less frequently. Some notable individuals with the name Rex throughout history include:

1. Rex Theodericus (454-526 AD), also known as Theodoric the Great, was the king of the Ostrogoths and ruled over a significant portion of the former Western Roman Empire.

2. Rex Horne (1828-1909) was an American politician and lawyer who served as the 13th Governor of North Carolina from 1891 to 1893.

3. Rex Ingram (1892-1950) was an American film director, producer, and screenwriter who directed several notable silent films, including "The Four Horsemen of the Apocalypse" (1921) and "The Prisoner of Zenda" (1922).

4. Rex Stout (1886-1975) was an American crime writer best known for his series of novels featuring the fictional detective Nero Wolfe.

5. Rex Harrison (1908-1990) was an English actor renowned for his performances in films like "Cleopatra" (1963), for which he won an Academy Award, and the stage and film adaptations of "My Fair Lady" (1956 and 1964, respectively).

While the name Rex has retained its association with royalty and leadership over the centuries, it has also taken on additional connotations related to strength, power, and masculinity.

Sourced from namecensus.com.

Popularity

Rex over time

The chart below shows babies named Rex registered in England and Wales in the years where the name appears in the published records, from 1996 to 2024. Empty years are left out so rare names are not stretched across long periods where the published files do not show any registrations.

For Rex, the clearest high point is 2021. The latest England and Wales figure is 228 births in 2024, compared with 396 at the peak.

Babies born per year

Rex
099198297396199620102024

Decades

Rex by decade

Decade totals smooth out the yearly jumps and make it easier to see whether Rex was a short-lived spike or a name that stayed in regular use. Average rank is calculated only from years where a published rank exists.

Decade Average rank Total births Years covered
2020s #173 1,579 5
2010s #303 2,159 10
2000s #942 259 10
1990s #1706 28 4

Geography

Where Rex is most common

The bars show the latest published local birth counts for Rex. They are useful for spotting where the name is showing up in real numbers, while the rank beside each bar shows how strongly it performs inside that region.

Rex ranks best in Northern Ireland in the latest published regional snapshot for that area, where it placed #352 in 2022.

Scotland
9
Northern Ireland
4

Across the UK

Rex in Scotland and Northern Ireland

Scotland (NRS)

#382 in 2024

12 years of NRS records, 134 total registered

Northern Ireland (NISRA)

#352 in 2022

7 years of NISRA records, 26 total registered

Notable bearers

Famous people named Rex

  • Rex Neame

    cricketer

    English cricketer (1936-2008)

    1936-2008

  • Rex Winsbury

    writer; journalist

    British writer-journalist (1935-2015)

    1935-2015

  • Rex Richards

    actor; rugby union player

    Welsh rugby union player (1934-1989)

    1934-1989

  • Rex Williams

    snooker player

    English snooker player

    1933-

  • Rex Porter

    pole vaulter

    British pole vaulter

    1932-2003

  • Rex Tilley

    association football player

    English footballer (1929-2016)

    1929-2016

  • Rex Robinson

    actor; television actor

    British actor (1926-2015)

    1926-2015

  • Rex Willis

    rugby union player

    Welsh rugby union footballer (1924-2000)

    1924-2000

Related

Names similar to Rex

FAQ

Rex: questions and answers

How popular is the name Rex in the UK right now?

In 2024, Rex was ranked #216 for boys in England and Wales, with 228 births registered.

When was Rex most popular?

The peak year on record was 2021, with 396 babies registered as Rex in England and Wales.

What is the meaning and origin of Rex?

A masculine Latin name meaning "king" or "ruler".

How many people are called Rex in the UK?

A total of 4,025 babies have been registered as Rex across the 29 years of ONS England & Wales records shown here, plus 134 more in Scotland and 26 in Northern Ireland.

Where is Rex most common?

In the latest published local rankings, Rex ranks best in Northern Ireland, where it placed #352 in 2022. The regional bars on this page use birth counts, so they also reflect the size of each region.

Which records is this page based on?

The England and Wales timeline uses ONS baby-name records. Scotland figures come from NRS and Northern Ireland figures come from NISRA. Counts are registrations in published baby-name files. The living estimate uses those birth registrations with ONS national life tables.